Soil mulching can mitigate soil water deifciency impacts on rainfed maize production in semiarid environments

ZHU Lin; LIU Jian-liang; LUO Sha-sha; BU Ling-duo; CHEN Xin-ping; LI Shi-qing

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Soil mulching can mitigate soil water deifciency impacts on rainfed maize production in semiarid environments

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Temporaly irregular rainfal distribution and inefifcient rainwater management create severe constraints on crop production in rainfed semiarid areas. Gravel and plastic iflm mulching are effective methods for improving agricultural productivity and water utilization. However, the effects of these mulching practices on soil water supply and plant water use associated with crop yield are not wel understood. A 3-yr study was conducted to analyze the occurrence and distribution of dry spels in a semiarid region of Northwest China and to evaluate the effects of non-mulching (CK), gravel mulching (GM) and plastic iflm mulching (FM) on the soil water supply, plant water use and maize (Zea mays L.) grain yield. Rainfal analysis showed that dry spels of ≥5 days occurred frequently in each of 3 yr, accounting for 59.9–69.2% of the maize growing periods. The >15-d dry spels during the jointing stage would expose maize plants to particularly severe water stress. Compared with the CK treatment, both the GM and FM treatments markedly increased soil water storage during the early growing season. In general, the total evapotranspiration (ET) was not signiifcantly different among the three treatments, but the mulched treatments signiifcantly increased the ratio of pre- to post-silking ET, which was closely associated with yield improvement. As a result, the grain yield signiifcantly increased by 17.1, 70.3 and 16.7% for the GM treatment and by 28.3, 87.6 and 38.2% for the FM treatment in 2010, 2011 and 2012, respectively, compared with the CK treatment. It’s concluded that both GM and FM are effective strategies for mitigating the impacts of water deifcit and improving maize production in semiarid areas. However, FM is more effective than GM.

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《农业科学学报（英文版）》 |2015年第1期|58-67|共10页
作者
ZHU Lin; LIU Jian-liang; LUO Sha-sha; BU Ling-duo; CHEN Xin-ping; LI Shi-qing;
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作者单位

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, P.R.China;

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, P.R.China;

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, P.R.China;

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, P.R.China;

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, P.R.China;

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling 712100, P.R.China;

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Soil mulching can mitigate soil water deifciency impacts on rainfed maize production in semiarid environments

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